EP1260768A3 - A combustion chamber - Google Patents

A combustion chamber Download PDF

Info

Publication number
EP1260768A3
EP1260768A3 EP02253028A EP02253028A EP1260768A3 EP 1260768 A3 EP1260768 A3 EP 1260768A3 EP 02253028 A EP02253028 A EP 02253028A EP 02253028 A EP02253028 A EP 02253028A EP 1260768 A3 EP1260768 A3 EP 1260768A3
Authority
EP
European Patent Office
Prior art keywords
fuel
air
combustion zone
mixing ducts
combustion chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02253028A
Other languages
German (de)
French (fr)
Other versions
EP1260768B1 (en
EP1260768A2 (en
Inventor
Christopher Freeman
Ivor John Day
Thomas Scarinci
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce Canada Ltd
Rolls Royce PLC
Original Assignee
Rolls Royce Canada Ltd
Rolls Royce PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rolls Royce Canada Ltd, Rolls Royce PLC filed Critical Rolls Royce Canada Ltd
Publication of EP1260768A2 publication Critical patent/EP1260768A2/en
Publication of EP1260768A3 publication Critical patent/EP1260768A3/en
Application granted granted Critical
Publication of EP1260768B1 publication Critical patent/EP1260768B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
    • F23R3/04—Air inlet arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/34—Feeding into different combustion zones
    • F23R3/346—Feeding into different combustion zones for staged combustion

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Gas Burners (AREA)

Abstract

A three-stage lean burn combustion chamber (28) comprises a primary combustion zone (36), a secondary combustion zone (40) and a tertiary combustion zone (44). Each of the combustion zones (36,40,44) is supplied with premixed fuel and air by respective fuel and air mixing ducts (54,70,92). The fuel and air mixing ducts (54,70,92) have a plurality of air injection slots (62,64,76,98) spaced apart transversely to the direction of flow through the fuel and air mixing ducts (54,70,92). The air injection slots (62,64,76,98) extend in the direction of flow through the fuel and air mixing ducts (54,70,92) to the reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone (36,40,44). This reduces the generation of harmful vibrations in the combustion chamber (28).
EP02253028.1A 2001-05-15 2002-04-29 A tubular combustion chamber Expired - Lifetime EP1260768B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0111788 2001-05-15
GBGB0111788.6A GB0111788D0 (en) 2001-05-15 2001-05-15 A combustion chamber

Publications (3)

Publication Number Publication Date
EP1260768A2 EP1260768A2 (en) 2002-11-27
EP1260768A3 true EP1260768A3 (en) 2004-11-17
EP1260768B1 EP1260768B1 (en) 2014-07-23

Family

ID=9914629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02253028.1A Expired - Lifetime EP1260768B1 (en) 2001-05-15 2002-04-29 A tubular combustion chamber

Country Status (4)

Country Link
US (2) US6732527B2 (en)
EP (1) EP1260768B1 (en)
CA (1) CA2384336C (en)
GB (1) GB0111788D0 (en)

Families Citing this family (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8982856B2 (en) 1996-12-06 2015-03-17 Ipco, Llc Systems and methods for facilitating wireless network communication, satellite-based wireless network systems, and aircraft-based wireless network systems, and related methods
US7054271B2 (en) 1996-12-06 2006-05-30 Ipco, Llc Wireless network system and method for providing same
US8410931B2 (en) 1998-06-22 2013-04-02 Sipco, Llc Mobile inventory unit monitoring systems and methods
US6891838B1 (en) 1998-06-22 2005-05-10 Statsignal Ipc, Llc System and method for monitoring and controlling residential devices
US6437692B1 (en) 1998-06-22 2002-08-20 Statsignal Systems, Inc. System and method for monitoring and controlling remote devices
US6914893B2 (en) 1998-06-22 2005-07-05 Statsignal Ipc, Llc System and method for monitoring and controlling remote devices
US7650425B2 (en) 1999-03-18 2010-01-19 Sipco, Llc System and method for controlling communication between a host computer and communication devices associated with remote devices in an automated monitoring system
GB0111788D0 (en) * 2001-05-15 2001-07-04 Rolls Royce Plc A combustion chamber
US7480501B2 (en) 2001-10-24 2009-01-20 Statsignal Ipc, Llc System and method for transmitting an emergency message over an integrated wireless network
US8489063B2 (en) 2001-10-24 2013-07-16 Sipco, Llc Systems and methods for providing emergency messages to a mobile device
US7424527B2 (en) 2001-10-30 2008-09-09 Sipco, Llc System and method for transmitting pollution information over an integrated wireless network
ITMI20012781A1 (en) * 2001-12-21 2003-06-21 Nuovo Pignone Spa IMPROVED ASSEMBLY OF PRE-MIXING CHAMBER AND COMBUSTION CHAMBER, LOW POLLUTING EMISSIONS FOR GAS TURBINES WITH FUEL
GB2390150A (en) * 2002-06-26 2003-12-31 Alstom Reheat combustion system for a gas turbine including an accoustic screen
GB0230070D0 (en) * 2002-12-23 2003-01-29 Bowman Power Systems Ltd A combustion device
EP1460339A1 (en) * 2003-03-21 2004-09-22 Siemens Aktiengesellschaft Gas turbine
US7140184B2 (en) * 2003-12-05 2006-11-28 United Technologies Corporation Fuel injection method and apparatus for a combustor
ITMI20032621A1 (en) * 2003-12-30 2005-06-30 Nuovo Pignone Spa COMBUSTION SYSTEM WITH LOW POLLUTING EMISSIONS
US8031650B2 (en) 2004-03-03 2011-10-04 Sipco, Llc System and method for monitoring remote devices with a dual-mode wireless communication protocol
US7756086B2 (en) 2004-03-03 2010-07-13 Sipco, Llc Method for communicating in dual-modes
US20060107667A1 (en) * 2004-11-22 2006-05-25 Haynes Joel M Trapped vortex combustor cavity manifold for gas turbine engine
US9439126B2 (en) 2005-01-25 2016-09-06 Sipco, Llc Wireless network protocol system and methods
WO2007033306A2 (en) * 2005-09-13 2007-03-22 Rolls-Royce Corporation, Ltd. Gas turbine engine combustion systems
US20070074518A1 (en) * 2005-09-30 2007-04-05 Solar Turbines Incorporated Turbine engine having acoustically tuned fuel nozzle
US7703288B2 (en) * 2005-09-30 2010-04-27 Solar Turbines Inc. Fuel nozzle having swirler-integrated radial fuel jet
US8881531B2 (en) * 2005-12-14 2014-11-11 Rolls-Royce Power Engineering Plc Gas turbine engine premix injectors
US8061141B2 (en) * 2007-09-27 2011-11-22 Siemens Energy, Inc. Combustor assembly including one or more resonator assemblies and process for forming same
US8028512B2 (en) 2007-11-28 2011-10-04 Solar Turbines Inc. Active combustion control for a turbine engine
EP2107313A1 (en) * 2008-04-01 2009-10-07 Siemens Aktiengesellschaft Fuel staging in a burner
US8176739B2 (en) * 2008-07-17 2012-05-15 General Electric Company Coanda injection system for axially staged low emission combustors
US20100236245A1 (en) * 2009-03-19 2010-09-23 Johnson Clifford E Gas Turbine Combustion System
US8646703B2 (en) * 2011-08-18 2014-02-11 General Electric Company Flow adjustment orifice systems for fuel nozzles
US9140455B2 (en) * 2012-01-04 2015-09-22 General Electric Company Flowsleeve of a turbomachine component
US20140033719A1 (en) * 2012-08-02 2014-02-06 Rahul Ravindra Kulkarni Multi-step combustor
US9212823B2 (en) 2012-09-06 2015-12-15 General Electric Company Systems and methods for suppressing combustion driven pressure fluctuations with a premix combustor having multiple premix times
US9404659B2 (en) * 2012-12-17 2016-08-02 General Electric Company Systems and methods for late lean injection premixing
US9217373B2 (en) 2013-02-27 2015-12-22 General Electric Company Fuel nozzle for reducing modal coupling of combustion dynamics
EP3008391B1 (en) 2013-06-11 2020-05-06 United Technologies Corporation Combustor with axial staging for a gas turbine engine
US20150167980A1 (en) * 2013-12-18 2015-06-18 Jared M. Pent Axial stage injection dual frequency resonator for a combustor of a gas turbine engine
WO2018144008A1 (en) 2017-02-03 2018-08-09 Siemens Aktiengesellschaft Combustor with three-dimensional lattice premixer
WO2018144006A1 (en) 2017-02-03 2018-08-09 Siemens Aktiengesellschaft Method for normalizing fuel-air mixture within a combustor
US11262073B2 (en) 2017-05-02 2022-03-01 General Electric Company Trapped vortex combustor for a gas turbine engine with a driver airflow channel
WO2018212761A1 (en) 2017-05-16 2018-11-22 Siemens Aktiengesellschaft Binary fuel staging scheme for improved turndown emissions in lean premixed gas turbine combustion
US11286884B2 (en) * 2018-12-12 2022-03-29 General Electric Company Combustion section and fuel injector assembly for a heat engine
US11643198B2 (en) * 2019-01-15 2023-05-09 Curtis Miller Vertical lift single engine vehicle system
US11506384B2 (en) * 2019-02-22 2022-11-22 Dyc Turbines Free-vortex combustor
CN110631049B (en) * 2019-10-12 2020-12-11 中国科学院工程热物理研究所 Soft combustion chamber of gas turbine
US11754288B2 (en) 2020-12-09 2023-09-12 General Electric Company Combustor mixing assembly
CN113757720B (en) * 2021-09-18 2023-01-31 北京航空航天大学 Combustion oscillation control device and method and combustion chamber

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2560074A (en) * 1948-12-21 1951-07-10 Lummus Co Method and apparatus for burning fuel
US4412414A (en) * 1980-09-22 1983-11-01 General Motors Corporation Heavy fuel combustor
US5235814A (en) * 1991-08-01 1993-08-17 General Electric Company Flashback resistant fuel staged premixed combustor
US5475979A (en) * 1993-12-16 1995-12-19 Rolls-Royce, Plc Gas turbine engine combustion chamber
EP0863369A2 (en) * 1997-03-07 1998-09-09 R. Jan Mowill Single stage combustor with fuel / air premixing
US6016658A (en) * 1997-05-13 2000-01-25 Capstone Turbine Corporation Low emissions combustion system for a gas turbine engine
US6164055A (en) * 1994-10-03 2000-12-26 General Electric Company Dynamically uncoupled low nox combustor with axial fuel staging in premixers
EP1108957A1 (en) * 1999-12-16 2001-06-20 Rolls-Royce Plc A combustion chamber

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919840A (en) * 1973-04-18 1975-11-18 United Technologies Corp Combustion chamber for dissimilar fluids in swirling flow relationship
GB1489339A (en) 1973-11-30 1977-10-19 Rolls Royce Gas turbine engine combustion chambers
US4044553A (en) 1976-08-16 1977-08-30 General Motors Corporation Variable geometry swirler
US4271675A (en) 1977-10-21 1981-06-09 Rolls-Royce Limited Combustion apparatus for gas turbine engines
US4263780A (en) * 1979-09-28 1981-04-28 General Motors Corporation Lean prechamber outflow combustor with sets of primary air entrances
EP0554325B1 (en) 1990-10-23 1995-07-26 ROLLS-ROYCE plc Gasturbine combustion chamber and method of operation thereof
GB9023004D0 (en) * 1990-10-23 1990-12-05 Rolls Royce Plc A gas turbine engine combustion chamber and a method of operating a gas turbine engine combustion chamber
GB9410233D0 (en) * 1994-05-21 1994-07-06 Rolls Royce Plc A gas turbine engine combustion chamber
US5636510A (en) * 1994-05-25 1997-06-10 Westinghouse Electric Corporation Gas turbine topping combustor
US6176087B1 (en) 1997-12-15 2001-01-23 United Technologies Corporation Bluff body premixing fuel injector and method for premixing fuel and air
US6141954A (en) 1998-05-18 2000-11-07 United Technologies Corporation Premixing fuel injector with improved flame disgorgement capacity
US6298667B1 (en) * 2000-06-22 2001-10-09 General Electric Company Modular combustor dome
GB0111788D0 (en) * 2001-05-15 2001-07-04 Rolls Royce Plc A combustion chamber

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2560074A (en) * 1948-12-21 1951-07-10 Lummus Co Method and apparatus for burning fuel
US4412414A (en) * 1980-09-22 1983-11-01 General Motors Corporation Heavy fuel combustor
US5235814A (en) * 1991-08-01 1993-08-17 General Electric Company Flashback resistant fuel staged premixed combustor
US5475979A (en) * 1993-12-16 1995-12-19 Rolls-Royce, Plc Gas turbine engine combustion chamber
US6164055A (en) * 1994-10-03 2000-12-26 General Electric Company Dynamically uncoupled low nox combustor with axial fuel staging in premixers
EP0863369A2 (en) * 1997-03-07 1998-09-09 R. Jan Mowill Single stage combustor with fuel / air premixing
US6016658A (en) * 1997-05-13 2000-01-25 Capstone Turbine Corporation Low emissions combustion system for a gas turbine engine
EP1108957A1 (en) * 1999-12-16 2001-06-20 Rolls-Royce Plc A combustion chamber

Also Published As

Publication number Publication date
GB0111788D0 (en) 2001-07-04
CA2384336A1 (en) 2002-11-15
CA2384336C (en) 2010-12-14
US20040154301A1 (en) 2004-08-12
US6959550B2 (en) 2005-11-01
EP1260768B1 (en) 2014-07-23
EP1260768A2 (en) 2002-11-27
US20020172904A1 (en) 2002-11-21
US6732527B2 (en) 2004-05-11

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